[PHP] OT-best PDF creation tool

[Ryan A]

Hey guys,
I know this is totally off topic on a php list but I have a client who wants a PDF 
document and since I have never made one before...which is the easiest and best tool 
(hopefully free) to make a PDF form?
I know a lot of you guys make websites yourselfs and most proberly worked on something 
like this so any comments,suggestions or links are appreciated.
Cheers,
-Ryan.